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Note 10 - Employee Benefits (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Employee Benefit Costs |  | $ 17,965 | $ 15,728
Other Labor-related Expenses |  | 4,900 | 2,900
Insured Maximum Exposure Per Employee |  |  | 1,000
Aggregate Insurance Deductible for Employees | $ 4,000 |  |
Operating Expense [Member] |  |  |
Employee Benefit Costs |  | $ 17,400 | $ 15,200

X
- Definition Represents the amount of aggregate insurance deductible for employees, with regard to workers' compensation. + References No definition available. + Details
Name: | hnrg_AggregateInsuranceDeductibleForEmployees
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of employee benefit costs recorded during the period. + References No definition available. + Details
Name: | hnrg_EmployeeBenefitCosts
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the insurance maximum exposure per employee with regard to workers' compensation. + References No definition available. + Details
Name: | hnrg_InsuredMaximumExposurePerEmployee
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of labor-related expenses classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_OtherLaborRelatedExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |